Installing the post-processing stack

First off, you'll need the latest release of the Post Processing Stack VRchat supports.

Note: Post Processing Stack v2 is free. It does not cost money, and it is not on the Unity Asset Store. Do not buy post-processing systems off the Asset Store, they will not work in VRchat.

Fortunately, the latest version of VRC's SDK will install it for you automatically!

However, here are some manual install steps if you don't have it.

1. From the Window menu in the menu bar, select Package Manager.
2. From the top-left corner of the Package Manager window, select "All packages".
3. Select Post Processing.
4. From the top-right corner, select version 3.0.3 and click Install.

Now you've got Post Processing v2 installed!